RE: What will this hurt?
When I talked to the owner of the VBG fallaway,this is exactly what he reccomended doing.As long as your nock is setup to compensate it really shouldn't make that much difference.Of course it will make for a little less level nock travel.
If you notice any problems in tuning,you may want to try a slightly stiffer spine arrow but I really doubt that it will make that much difference.
Also make sure the rest is setup to hit FLAT on the shelf.This was something else he advised.
My VBG fallaway should be in tomorrow and I will be able to put it on my new Xtec this weekend so I may be able to add more then.